Heating installation for motor vehicles



Feb. 255 1964 R. FRIEDL ETAL 3,122,319

HEATING INSTALLATION-FOR MOTOR VEHICLES Filed March l, 1962 YnrenO/'SJ v Peiner Friedl /Pobert von Linde ydwu L 2274424 Attorney United Statesl Patent O 3,122,319 HEATING INSTALLATION FOR MUTOR VEHlCLES Reiner Friedl, Starnberg, Upper Bavaria, and Robert von Linde, Grateliing, 'Municln Germany, assignors to Webasto Werk G.m.b.H., Stockdorf, near Munich,

Germany f Filed lidar. 1, 19.62, Ser.'No. 176,699 Claims priority, applicationswitzerland Mar. 8, 1961 `3 Claims. ,(Cl. 237-8) .The invention relates to heating installations for 4vehicles, more especially for motor vehicles driven by a water cooled engine. It is concerned with an installay tion in which a change-over cock of a heating device independent of the vehicle engine, and a heatemitter, are

connected in series, and being adapted tok be short circuited by the change-over cock, in one position of the cock, through a short-circuit pipe.

Heating devices are known for motor vehicles equipped with a water-cooled engine in which the engine, cooler, changeover cock, heat emitter, and heating means independent of the enginekot the vehicle, are arranged in` series, a short circuit line being switches on through a change-over cock, andin an appropriate position the change-over cock closes the circuit of the cooling medium through the heat emitter and the heating device.

These heating installations however operate only very sluggishly and for that reason are not successful in practice.

It is the object of the present invention to provide a heatinginstallation for vehicles by which a substantially shorter heating up time can be achieved than with the known heating systems.

According to the invention the drivingr engine is connected in parallel with the cooler, and a thermostat is provided in one of the connection pipes, while the other conection pipe is connected .with a short circuit line, and a line branching oit from the connection pipe between the thermostat and the driving engine leads to a change-over cock, where it is closed by the cock in one position, while in another position of the cock it is connected with the line which leads to the kheating appliance.

In a preferred embodiment of the invention the changeover cock is in the position in which the vehicle engine is switched in series with the heating device andthe heat emitter, simultaneously switches on the motor of the heating device. In this way, actuation and adjustment of the installation to engine pre-heating is possible with onlya single manipulation. f f

In the following description, referring to the accompanying drawing, one example of construction of a heating device according to the invention is described, whereby other characteristic features and advantages of the invention are demonstrated.

in the heating installation as shown inthe aforesaid drawing, 1 denotes a water-cooled vehicle engine which is connected to a cooler 2 by way of pipes 3 and 4. In the pipeline 4 is mounted ya thermostat 5 which opens the passage tothe cooler 2 only at a predetermined temperature of the cooling medium. kFrom the `part 6 of the pipe 4, between the thermostat 5 and the vehicle engine 1, a pipe 7 branches ott and leads to a change-over cock ti. A pipe 9 connects a heatingdevice 1t) with the changeover valve or cock 8.' The heating device 10 is employed to provide an auxiliary source of heat to heat the coolant ot the engine 1. The coolant which is heated in the heat-- ing device 10 by a source of heat, for example,`by a burner ted from the fuel storage ofthe vehicle, passes ythrough a connection pipe 13. When the valve r8 is in the position Il, shown by a dotted line in the drawing, a closed heating circuit is established through a short circuit pipe.

Cil

, 3,122,319 Patented Feb. 25K, 1964 "ice f 2 pole switch 14 is closed by the valve in this position, whereby, as can readily be seen from the wiring diagram, a driving motor 15 of the heating device 10 and a fan motor 16 with fan 17 are placed in circuit.

f ln the position i, shown in the drawing, of the changeover valve t5, on the other hand, only a switch 17 kis closed so that only the driving motor 15 of the heating vdevice 1@ receives current. yIn this switch position,

therefore, a pre-heating of the vehicle engine 1 takes place, the engine being connected kin a closed heating circuit through the pipes 7 and 9, heating appliance 1li, pipe 13, heat emitter 12, a pipe 1S, the short-circuit pipe 11 and a pipe 19 branching oit from the short-circuit pipe 11 and leading to the pipe 3. t

Since in position I of the change-over valvethe motor 16 ot the heat emitter 12 is out of operation, the latter gives off relatively little heat, with the result thatV the heat generated by the heating appliance 1t) is applied almost entirely to the vehicle engine, until the cooling water reaches a temperature at which the thermostat 5 p opens. In a preferred embodiment of the invention, a further switch position is provided (not illustrated in the present context for simplicitys sake) in which in the position I of the change-over valve 8 the circuit of the driving motor 15 of the heating means itl is interrupted and in its place the circuit of the motor 1a of the heat transmitter 12 can be closed. In this way, therefore, the installation then operated as a heating system dependent on the engine, because, conversely, when the'engine is running, it sends the coolingwater which it has heated, through the heating emitter 12 .which then receives a supply of air to be heated through the blower f y driven by the motor 16. v n

In a simple form of construction, however, the abovementioned switch position is not required, it simply ra` yof the heat transmitter 12 through a pipe with an aperture in the vehicle directed to receive air as the result of movement of the vehicle.

In such case the installation operates, when the motor 15 yis switched off, purely as a heating system dependent n yon the vehicle engine, whereas with' the motor-15 switched 11, a heat emitter 12 and the connection pipe 13. A twoon, the heating means 1@ supplies additional heat, a factor which is of advantage to the more speedy heating up of the vehicle or when the weather is exceptionally cold.

The invention is not limited to the example of construction illustrated and described herein, but. may be` realised in practice also in the most diverse modiiications.y

What we claim is: y p l. A heating system for a motor vehicle having' in combination a liquid cooled engine; a radiator; a first and a second connection pipe connecting said radiator to said engine in parallel relation thereto; a heating yappliance normally directly communicating with said iirst connection pipe;V heat emission means connectedy between said eating appliance and said second connection pipe, said heat emission means including means for directing heated f air into the interior of the vehicle; achange-over valve selectively movable betweenftwo positions and connected between said irst connection pipe and said heating appliance; and a short-circuit conduit having one end dis-r posed to communicate with said heat emission means and y said second connection pipe and the other end disposed to communicate with said change-over valve, said changeovcr valve being effective in one position to block communication between said tirst connection pipe and said f 3 l establish communication between said iirst connection on both the motor 0f said heating appliance and the drivpipe and said heating appliance. ing means for the fan of said heat emission means.

2. A heating installation as claimed in claim l includ- I ing a motor for said heating appliance; a switch coupled Re'ms Cmd m the me 0f this Pd'fent With said changeover valve, said v alve in said one posi- 5 UNITED STATES PATENTS tion being operative to switch on said motor of said heating appliance. 2,507,643 Oaks May 16, 1950 3. A heatin installation as claimed in claim 1 including an electric:T motor for said heating appliance; a fan FOREIGN PATENTS for said heat emitter; electric driving means for said fan; 10 531,718 Canada Oct. 16, 1956 a switch coupled with said change-over valve in said otliel 767,631 France May 7, 1934 position of said change-over valve simultaneously switches 809,112 France Dec. 3, 1936 

1. A HEATING SYSTEM FOR A MOTOR VEHICLE HAVING IN COMBINATION A LIQUID COOLED ENGINE; A RADIATOR; A FIRST AND A SECOND CONNECTION PIPE CONNECTING SAID RADIATOR TO SAID ENGINE IN PARALLEL RELATION THERETO; A HEATING APPLIANCE NORMALLY DIRECTLY COMMUNICATING WITH SAID FIRST CONNECTION PIPE; HEAT EMISSION MEANS CONNECTED BETWEEN SAID HEATING APPLIANCE AND SAID SECOND CONNECTION PIPE, SAID HEAT EMISSION MEANS INCLUDING MEANS FOR DIRECTING HEATED AIR INTO THE INTERIOR OF THE VEHICLE; A CHANGE-OVER VALVE SELECTIVELY MOVABLE BETWEEN TWO POSITIONS AND CONNECTED BETWEEN SAID FIRST CONNECTION PIPE AND SAID HEATING APPLIANCE; AND A SHORT-CIRCUIT CONDUIT HAVING ONE END DISPOSED TO COMMUNICATE WITH SAID HEAT EMISSION MEANS AND SAID SECOND CONNECTION PIPE AND THE OTHER END DISPOSED TO COMMUNICATE WITH SAID CHANGE-OVER VALVE, SAID CHANGEOVER VALVE BEING EFFECTIVE IN ONE POSITION TO BLOCK COMMUNICATION BETWEEN SAID FIRST CONNECTION PIPE AND SAID HEATING APPLIANCE TO THEREBY ESTABLISH A CLOSED CIRCUIT BETWEEN SAID HEATING APPLIANCE, SAID HEAT EMISSION MEANS, AND SAID SHORT-CIRCUIT CONDUIT, AND IN THE OTHER POSITION TO ESTABLISH COMMUNICATION BETWEEN SAID FIRST CONNECTION PIPE AND SAID HEATING APPLIANCE. 